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It's sort of *technically* true. The Nicalis translation is much more stale than AGTP's translation, but doesn't seem to have as many inconsistencies with the original Japanese source. Granted, the AGTP doesn't do that bad of a job (has a handful of errors at most), but that is more errors than the Nicalis translation. Well, excluding the initial translation Nicalis released, which was frought with English grammatical errors here and there.
I said the Nicalis translation was more accurate, that doesn't mean that it is better. Essentially the AGTP one is better written, but the Nicalis one is more accurate. Both translations are flawed in different aspects. However as a theory reference the Nicalis translation is king.
*cough* they are just based on certain theories. *cough cough*
Edit: I have thought of how it could happen: Arthur knew he was being hunted by the Doctor, and that sooner or later he would be caught, So he left those items to aid someone to destroy the demon crown.